/*
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 *
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 *
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 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
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 *     documentation and/or other materials provided with the distribution.
 *
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 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package test;

import java.awt.*;

import javax.swing.*;
import javax.swing.text.*;

import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeEvent;
import java.text.*;

/**
 * FormatterFactoryDemo.java requires no other files.
 */
public class FormatterFactoryDemo extends JPanel implements
		PropertyChangeListener {
	private static final long serialVersionUID = -748462938769683965L;
	// Values for the text fields
	private double amount = 100000;
	private double rate = .075; // 7.5 %
	private int numPeriods = 30;

	// Labels to identify the fields
	private JLabel amountLabel;
	private JLabel rateLabel;
	private JLabel numPeriodsLabel;
	private JLabel paymentLabel;

	// Strings for the labels
	private static String amountString = "Loan Amount: ";
	private static String rateString = "APR (%): ";
	private static String numPeriodsString = "Years: ";
	private static String paymentString = "Monthly Payment: ";

	// Fields for data entry
	private JFormattedTextField amountField;
	private JFormattedTextField rateField;
	private JFormattedTextField numPeriodsField;
	private JFormattedTextField paymentField;

	// Formats to format and parse numbers
	private NumberFormat amountDisplayFormat;
	private NumberFormat amountEditFormat;
	private NumberFormat percentDisplayFormat;
	private NumberFormat percentEditFormat;
	private NumberFormat paymentFormat;

	public FormatterFactoryDemo() {
		super(new BorderLayout());
		setUpFormats();
		double payment = computePayment(amount, rate, numPeriods);

		// Create the labels.
		amountLabel = new JLabel(amountString);
		rateLabel = new JLabel(rateString);
		numPeriodsLabel = new JLabel(numPeriodsString);
		paymentLabel = new JLabel(paymentString);

		// Create the text fields and set them up.
		amountField = new JFormattedTextField(new DefaultFormatterFactory(
				new NumberFormatter(amountDisplayFormat), new NumberFormatter(
						amountDisplayFormat), new NumberFormatter(
						amountEditFormat)));
		amountField.setValue(new Double(amount));
		amountField.setColumns(10);
		amountField.addPropertyChangeListener("value", this);

		NumberFormatter percentEditFormatter = new NumberFormatter(
				percentEditFormat) {
			private static final long serialVersionUID = -708866283018036921L;

			public String valueToString(Object o) throws ParseException {
				Number number = (Number) o;
				if (number != null) {
					double d = number.doubleValue() * 100.0;
					number = new Double(d);
				}
				return super.valueToString(number);
			}

			public Object stringToValue(String s) throws ParseException {
				Number number = (Number) super.stringToValue(s);
				if (number != null) {
					double d = number.doubleValue() / 100.0;
					number = new Double(d);
				}
				return number;
			}
		};
		rateField = new JFormattedTextField(new DefaultFormatterFactory(
				new NumberFormatter(percentDisplayFormat), new NumberFormatter(
						percentDisplayFormat), percentEditFormatter));
		rateField.setValue(new Double(rate));
		rateField.setColumns(10);
		rateField.addPropertyChangeListener("value", this);

		numPeriodsField = new JFormattedTextField();
		numPeriodsField.setValue(new Integer(numPeriods));
		numPeriodsField.setColumns(10);
		numPeriodsField.addPropertyChangeListener("value", this);

		paymentField = new JFormattedTextField(paymentFormat);
		paymentField.setValue(new Double(payment));
		paymentField.setColumns(10);
		paymentField.setEditable(false);
		paymentField.setForeground(Color.red);

		// Tell accessibility tools about label/textfield pairs.
		amountLabel.setLabelFor(amountField);
		rateLabel.setLabelFor(rateField);
		numPeriodsLabel.setLabelFor(numPeriodsField);
		paymentLabel.setLabelFor(paymentField);

		// Lay out the labels in a panel.
		JPanel labelPane = new JPanel(new GridLayout(0, 1));
		labelPane.add(amountLabel);
		labelPane.add(rateLabel);
		labelPane.add(numPeriodsLabel);
		labelPane.add(paymentLabel);

		// Layout the text fields in a panel.
		JPanel fieldPane = new JPanel(new GridLayout(0, 1));
		fieldPane.add(amountField);
		fieldPane.add(rateField);
		fieldPane.add(numPeriodsField);
		fieldPane.add(paymentField);

		// Put the panels in this panel, labels on left,
		// text fields on right.
		setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
		add(labelPane, BorderLayout.CENTER);
		add(fieldPane, BorderLayout.LINE_END);
	}

	/** Called when a field's "value" property changes. */
	public void propertyChange(PropertyChangeEvent e) {
		Object source = e.getSource();
		if (source == amountField) {
			amount = ((Number) amountField.getValue()).doubleValue();
		} else if (source == rateField) {
			rate = ((Number) rateField.getValue()).doubleValue();
		} else if (source == numPeriodsField) {
			numPeriods = ((Number) numPeriodsField.getValue()).intValue();
		}

		double payment = computePayment(amount, rate, numPeriods);
		paymentField.setValue(new Double(payment));
	}

	/**
	 * Create the GUI and show it. For thread safety, this method should be
	 * invoked from the event dispatch thread.
	 */
	private static void createAndShowGUI() {
		// Create and set up the window.
		JFrame frame = new JFrame("FormatterFactoryDemo");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		// Add contents to the window.
		frame.add(new FormatterFactoryDemo());

		// Display the window.
		frame.pack();
		frame.setVisible(true);
	}

	public static void main(String[] args) {
		// Schedule a job for the event dispatch thread:
		// creating and showing this application's GUI.
		SwingUtilities.invokeLater(new Runnable() {
			public void run() {
				// Turn off metal's use of bold fonts
				UIManager.put("swing.boldMetal", Boolean.FALSE);
				createAndShowGUI();
			}
		});
	}

	// Compute the monthly payment based on the loan amount,
	// APR, and length of loan.
	double computePayment(double loanAmt, double rate, int numPeriods) {
		double I, partial1, denominator, answer;

		numPeriods *= 12; // get number of months
		if (rate > 0.001) {
			I = rate / 12.0; // get monthly rate from annual
			partial1 = Math.pow((1 + I), (0.0 - numPeriods));
			denominator = (1 - partial1) / I;
		} else { // rate ~= 0
			denominator = numPeriods;
		}

		answer = (-1 * loanAmt) / denominator;
		return answer;
	}

	// Create and set up number formats. These objects also
	// parse numbers input by user.
	private void setUpFormats() {
		amountDisplayFormat = NumberFormat.getCurrencyInstance();
		amountDisplayFormat.setMinimumFractionDigits(0);
		amountEditFormat = NumberFormat.getNumberInstance();

		percentDisplayFormat = NumberFormat.getPercentInstance();
		percentDisplayFormat.setMinimumFractionDigits(2);
		percentEditFormat = NumberFormat.getNumberInstance();
		percentEditFormat.setMinimumFractionDigits(2);

		paymentFormat = NumberFormat.getCurrencyInstance();
	}
}
